<!DOCTYPE HTML>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<body>

<script>
class TestElement extends HTMLElement {
  constructor() {
    super();
    this._internals = this.attachInternals();
  }

  get internals() {
    return this._internals;
  }

  set internals(val) {
    throw "Can't set internals!";
  }
}
customElements.define("test-element", TestElement);

function createTestElement(id) {
  const element = document.createElement("test-element");
  element.id = id;
  document.body.appendChild(element);
  return element;
}

function axElementById(id) {
  return accessibilityController.accessibleElementById(id);
}

test(function(t) {
  const element = createTestElement("test1");
  element.internals.role = "button";
  assert_equals(element.role, null);
  assert_equals(element.internals.role, "button");
  assert_equals(axElementById("test1").role, "AXRole: AXButton");
}, "Role set through element internals affects role in AX object, doesn't affect element.role");

test(function(t) {
  const element = createTestElement("test2");
  element.internals.role = "button";
  assert_equals(element.role, null);
  assert_equals(element.internals.role, "button");
  assert_equals(axElementById("test2").role, "AXRole: AXButton");
  element.role = "checkbox";
  assert_equals(element.internals.role, "button");
  assert_equals(axElementById("test2").role, "AXRole: AXCheckBox");
}, "Role set through element internals can be overridden by element.role");

test(function(t) {
  const element = createTestElement("test3");
  element.internals.role = "button";
  assert_equals(axElementById("test3").role, "AXRole: AXButton");
  element.internals.role = "checkbox";
  assert_equals(element.internals.role, "checkbox");
  assert_equals(axElementById("test3").role, "AXRole: AXCheckBox");;
}, "Role set through element internals can be changed.");

</script>
</body>
